The war in Vietnam was a part of the Cold War because the fight was to stop the spread of communism and spread democracy. The purpose of the Cold War was to stop the Soviet Union from spreading communism, which was against treaties signed by the Big Four to stop imperialism. The United States felt that all countries should abide by those treaties, even though the US itself was still continuing the Manifest Dynasty. The Antiwar movement represented a break with the Cold War assumptions because all other wars were supported by the American population.
